Open Data supplied by Natural Environment Research Council (NERC)

Bissett-Bermann 9040 Conductivity Temperature and Depth

The basic configuration of the B-B 9040 CTD incorporates pressure, temperature and conductivity sensors which could be logged digitally. This system also made it possible to derive other parameters, such as salinity, depth and sound velocity.

The instrument was versatile and it was possible to attach a dissolved oxygen sensor or to change the CTD housing, allowing it to obtain data from deeper layers in the water column. The accuracy for salinity is ±0.02 ppt , and ±0.02°C for temperature.

This instrument was also known as the Plessey 9040.

RRS Challenger 8/78 CTD Data Documentation

Introduction

Documentation for the CTD data collected on RRS Challenger Cruise 8/78 (12-24 May 1978) by the Institute of Oceanographic Sciences, Bidston (now POL)

Port of Departure

Barry

Port of Return

Barry

Area

Celtic Sea

Caution

Some of the salinity data collected on this cruise are noisy (±0.02 psu)

Data Processing

The raw data were previously manually edited, resequenced and archived in 2 files. 0ne file contained temperature, salinity and depth frequencies and time elapsed and the other contained decca positional infomation.

These data were reprocessed in Febuary 2001.

Calibrations

The following constants (obtained from printouts of the data) were used to convert to real units and calibrate.

Part 1

Temperature Constant

2128.2

Salinity Constant

5001.6

Depth Constant

9718.0

Part 2

Temperature Constant

2127.7

Salinity Constant

5001.4

Depth Constant

9718.0

The downcasts had a temperature correction applied to lessen salinity spiking.